Question

Give two reasons to explain why a reflecting telescope is preferred over a refracting telescope

Answer 1

a) The reflecting telescopes are preferred over refracting type because of the following reasons:

(i) There is no chromatic aberration in case of reflecting telescopes as the objective is a mirror.

(ii) Spherical aberration is reduced in case of reflecting telescopes by using mirror objective in the form of a paraboloid.

Answer 2

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Give two reasons to explain why a reflecting telescope is preferred over a refracting telescope

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1)reflecting telescopes are lighter and easy to use

2)large aperture mirrors can be used to increase light gathering capacity .

3)they are free from chromatic aberration as no refraction takes place in a mirror

4)spherical aberration can be easily removed in case of mirrors by using parabollic mirrors

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